Re: buffer substring of only visible text

[Michael Heerdegen]

Samuel Wales <samologist@gmail.com> writes:

> i want to copy visible text from a region in a buffer, into
> a string.
>
> if any invisible regions are in the region, i want them to
> not be in the string.

Not a complicated task - and it seems that `backtrace--filter-visible'
is implementing exactly that:

#+begin_src emacs-lisp
(defun backtrace--filter-visible (beg end &optional _delete)
  "Return the visible text between BEG and END."
  (let ((result ""))
    (while (< beg end)
      (let ((next (next-single-char-property-change beg 'invisible)))
        (unless (get-char-property beg 'invisible)
          (setq result (concat result (buffer-substring beg (min end next)))))
        (setq beg next)))
    result))
#+end_src

If you don't want to rely on an internal function you might just copy
these few lines.

Michael.